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Re: draft-ietf-ipsec-<many>-00.txt



>  I do not recall the source, but my recollection is that it is not a good idea to
>  use DES MAC and DES CBC with the same key.  If you use two different keys, ont 
>  fro DES MAC and one for DES CBC, then there are no security concerns.
>  this raises some performance concerns.

You might be thinking of the papers by Stubblebine and Gligor in the
Oakland Security and Privacy symposia.  These should give great pause
to anyone attempting to combine related algorithms with the same key.
And to the idea of using CRC.


References: